Apparatus for latexing cords



Aprl zo, .1937.

N. J. RITZERT APPARATUS FOR LATEXING CORDS Original Filed eb.v 15, 1954 8 Sheets-Sheet 1 April 20,1937. N. J. Rn'zERT APPARATUS FOR LATEXING CORDS Original Filed Feb. l5, 1925-4 8 Sheets-Sheetl 2 April v20, 1937.

N. J. RITZERT APPARATUS FOR LATEXING CORDS originalvFiled Feb. 13, 195.4

8- Sheets-Shea?l 3 NQRMANJ. R11-ER Mme-w y Y N. J. RITZERT :APPARATUS FOR LATEXING CORUS Original Filed Feb. 15, 1934 8 Sheets-Sheet 4 NORMANIRITZERE by Z l April 20, 1937. N. J. RlTzERT 2,077,492

PPARATUS FOR `LATEXIINCTCCIRDS I original Filed Feb. 1:5, 195.4 s sheets-51mm- 5 F1a. lo.

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N. J. RITZERVT APPARATUS FOR LATEXING GORDS 8 Sheets-Sheet 6 NoRMAN J. Rlrzfm;

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Ap 20, 1937. y N. J. RlTzl-:RT

APPARATUS FOR LATEXING CORDS 8 Sheets-Sheet 7 Original Filed Feb. 13, 1.934

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April 20, 1937. N. J. RlTzERT l 2,077,492

APPARATUS FORy LATEXING CORDS originalv Filed Feb. 1s, ,193.4 a'shets-sneet 8 Y v Tmonm zafmwwfmsf;sffffzzfwww m22 NORMAN I Rm ERT, F16.z,1. L Z' WZ www,

I Patented Apr. 20, 1.937

UNITED STATES.

APrrrlazN'll OFFICE v APPARATUS FOR LATEXING CORDS Norman J. Ritzert, Dayton,v Ohio, assignor to The Dayton Rubber Mfg. Company, Dayton, Ohio,

a corporation of Ohio 8 Claims.

This invention relates to an apparatus for lmpregnating and coating cords with latex.

The` problems encountered in making this invention 'were to iind a means for thoroughly and completely impregnating and coating heavy cords with latex, such cords being used for the neutral axis portions of rubber belts; also to keep the latex from getting into the working parts of the -apparatus; also to main'tain the pulling of the cord under an even tension yet with the slightest convenient tension while it is passing through the latex; and also to shut off the machine automatically in the event of a snarl or a tangle.

One object of my invention is to provide a means for completely impregnating a cord with latex throughout its interior iibers, as well as to regulate the tension of the cord while impregnating it, and also to coat the cord after such impregnation.

Another object is to provide apparatus for im pregnating and/or coating the cord with latex, -whereby the interior fibers of the cord will be completely impregnated, the apparatus being provided with means for flexing and/or squeezing the cord to facilitate this impregnation.

Another object is to provide such an apparatus with its parts so arranged that the latex will be prevented from getting into the working parts thereof and interfering with the operation.

AnotherV object is to provide apparatus for lwinding up the impregnated and coated cordon to suitablel holders, and for regulating the tension of the cord while being so wound; also for winding the cord in level layers on the holder; and

also for disconnecting the power from the machine in the event of the cord becoming tangled or failing to wind.

Another object is to provide apparatus for regulating the level of the latex relative to the cord.

Another object is to provide means whereby the cord will be passed through the solution under as slight a tension as is convenient in order to enhance the opening up of the internal fibers and strands to facilitate the, impregnation thereof.

45 This applicationis a division of my applica- 'tion led February 13, 1934, Serial No.' 711,033,

now matured into Patent 2,040,105, issued May 12,

1936. l v In the drawings:

Figure 1 is adiagrammatic pian view, partly yin section, of the apparatus of my invention, showing the main ele 9^ Figure 2 is a di grammatic side elevation, partly in section, of the apparatus shown in Figurell; 55 Figure 3 is a side elevation, partly in section,

' cords are fed in circuitous paths under very slight ts involved in its operation;

(CL ill-17) of the' latex impregnating section of the apparatus;

Figure 4 is a section along the line 4 4 of Figure 3;

Figure 5 is a top plan view of the apparatus 5 shown in Figure 3; i l Figure 6 is a horizontal sectional view along the line 6-6 of Figure 3; 1 l

Figure 7 is a front elevational -view of the tension controlling and drying section of the apparatus;

Figure 8 is a side elevational view of the ltension controlling section of the apparatusl shown in Figure '7;

vFigure 9 is a-front elevational view of the winding section of the apparatus, showing the tension brakes and level-winding devices;

Figure 10 is an electrical wiring diagram showing the electrical control circuit of the apparatuSS.

Figure 11 is a righthand side elevation of the apparatus shown in Figure 9;

Figure 12 is a digarammatic verticall section along the line !2-.-l2 of Figure 9;

Figure 13 is a lefthand side elevation of the' apparatus shown in Figure 9, showing the solenoidal brake mechanism for regulating the tension of the cords;

Figure 14 is an enlarged top plan view of one of the solenoidal brake assemblies shown in Fig- Figure 15 is' an enlarged side elevation of the solenoidal brake assembly shown in Figure 14;

Figure 16 is a top plan view of a modified form of impregnating apparatus;

Figureii is ,a horizontal sectional view along the line il-i'i of Figure 19;

Figure 18 is a. horizontal sectional view along the line |8--I8 of Figure 19;

Figure 19 is al side elevation of the latex-impregnating apparatus shown in Figure 16;

Figure 20 is an enlargedA view of a portionof one of the cords'prior to its being impregnated and/or coated with latex;

Figure 21 is a view similar to Figure 20, but showing the cord after it has been impregnated and coated with latex.

The -apparatus briefly described (Figures 1 and 2) consists of a'latex tank'through which the 60 tension, the cords being thereby flexed and their internal= fibers thus opened up 4for more oonvenient impregnation: additional devices for squeezing the cord, while in the latex tank, may ,be optionally provided to enhance the impregnatvg ing action. Beyond the latex tank the cords pass under latex drying spouts over guide pulleys and around floating-arm pulleys connected with devices for controlling the tension thereof. Beyond the floating-arm pulleys, the cords pass through a level winding devi@ on to power-driven spools whose driving mech s equipped with brakes regulated by the iioatarm *pulley mechanism. 'I'he impregnating apparatus is provided with l means for raising and lowering the latex tank in order to control the level of the latex relative to the positions of the cords.

Latex-mpregnating section of the apparatus Referring to the drawings in detail, Figures 1 and 2 show the latex-impregnating section of the apparatus in relation to the other sections thereof, as previously described above. The unimpregnated cords I, 2. 3 and 4 are distributed 2o from spools 5, 8, 1 and 8 mounted upon a spool rack 9 provided for that purpose. Four spools and four cords are being shown for purposes of illustration only, it being understood. that a greater or lesser number of cords may be used in the apparatus.

The progress of the cord I will be traced through the apparatus, the courses of the other cords being substantially similar.

Beyond the spools, the cords pass through the distributor plate III mounted on the base Il of the latex-impregnating section of the apparatus (Figures 1 and 2). The base II carries an upper platform I2 (Figure 3) supported by the posts I3. The base II is supported on a main frame I4. The latter also supports the latex tank I5, which is suspended by cables I8 passing over the guide pulleys I1 on to windlass rods I8 (Figures 2 and 3). -The ends of the windlass rods I8 cany worm gears I9 which mesh with worms 20 mounted on the crank shaft 2|, one end of which is provided with the hand crank 22. Thus by turning the hand crank 22, the cable windlass shafts I8 are caused to revolve, winding up or unwinding the cables I8, and raising or lowering the latex tank I5 suspended thereby. In this manner the level of the latex uid in the tank may be adjusted relative to the apparatus above it.

Supported partly by the base I`I and partly by the platform I2 is a plurality of spindle shafts 23 having bearings 24 in. the base I I and bearings 25 in the upper platform'I2. Each one of the spindles 23 is provided at its lower end with a roller 28 having grooves 21 in the periphery thereof, these grooves being adapted to guide and space the various cords in their passage therethrough. Each spindle 23 is additionally provided with a pinion 28 by which it is driven (Figure 3). 'Ihe pinions 28 intermesh successively with one another (Figure 6) one of them being provided with a master spindle 29 (Figure 3), having a pinion 30 mounted on its uppermost end above the platform I2. Meshing with this pinion 30 is a gear 3| ona collar 32, the upperportion of lwhich is provided with a bevel gear 33. 'Ihe collar 32 is secured to a shaft 34 having bearings 35 and 36 in the main base II and the platform I2 respectively'.A The lower end of the shaft 34 is provided with a squeeze roller 31, and toits mid-portion is secured a gear 38. 'I'he gear 38'meshes withl a similar gear 39 (Figure 6). The latter is mount-w ed on a vertical spindle 48 in a manner similar to that of the spindle 34. and is provided on its lower end with a squeeze roller 4I similar to the squeeze roller 31 (Figures 1 and '4). The squeeze rollers 31 and 4I are separated from 9m? @Omer by a space somewhat less than the diameter of the cord I, so that the latter is compressed as it passes between them.

Beyond the squeeze rollers 31 and 4i, the ap paratus is provided with a plurality of spindles and grooved rollers similar to those already de scribed, and Vhence designated by the same numerals. 'I'hese other sets of rollers are driven by similar gearing to the rst set, through similar intermeshing pinions 28, master spindle 42, master pinion 43, gear 44 meshing therewith, and mounted on the collar 45 having the bevel pinion 45 attached thereto. The collar 45 is secured to the vertical shaft 41 (Figure 3) having bearings 48 and 49 in the main base l I and theplatform I2 respectively. 'I'he shaft 41 is provided with a squeeze roller 59 and. also with a gear 5I meshing with a.similar gear 52. The latter is secured to a vertical shaft 53 mounted in a similar manner to shaft 40, and carrying on its lower end the squeeze roller 54 (Figures 1 and 6). The squeeze rollers 50 and 54 are similar in construction and operation to the squeeze rollers 31 and 4I, of

- which they are substantially duplicates.

The bevel pinions 33 and 45 mesh respectively with bevel pinions 55 and 55 respectively, these being secured to the horizontal shaft 51 having bearing support in the pillow blocks 58 and 59 respectively (Figure 3). The pillow blocks 58 and 59'are mounted upon brackets 8|! and 8| re-V spectively, lthese being mounted upon the platform I2. Beyond the pillow block 59,l a bevel gear 82 is secured to the end of the horizontal shaft 51 (Figures 3 and 5). The bevel gear 52 meshes with a bevel pinion 53- fixed to the cross shaft 54 supported in the pillow blocks 65 and 55 respectively. The latter are supported on brackets 81 and 68 which in turn are supported by the platform I2. The outer end of the cross shaft A84 carries the drive pulley 89. The latter is provided with a groove 18 which is belted through suitable gearing to a source of power,

such as an electrical motor 1Il (Figure 10).

Likewise attached to the platform II and extending downward into the tank on each end of the two rows of rollers 28 are cord guide plates 12 and 13 respectively (Figure 3). These cord guide plates are provided with apertures 14 and 15 adapted to receive the cord and direct it onward into the groove 21, the apertures 14 and 15 being aligned with the grooves 21 for this'purpose. The cord guide plates -12 and 13 are secured to the platform II by the bolts 15 and 11 'Later-drying and tension-controlling section of the apparatusv The above-entitled section of the apparatus is shown in its relationship to the remainder of the apparatus in Figures 1 and 2,- and in enlarged detail in Figures '1 and 8. This section of the apparatus is supported by a frame 95.

The latex-drying portion is secured to a cross bracket 9i mounted on the upper part of the Irame 80. TheA cross bracket 9| supports the which the cords 2, 2 and 4 pass after leaving the apertures 92 in the aperture plate 19. Above each cord trough 92 is arranged an air pipe'92,

controlled by the valve 94, and leading to the air -troughs 92,the cords pass over guide pulleys.91

mountedv on the guide pulley shaft 92. A 'plurality of'these guide pulleys is provided, one

guide pulley for each cord being impregnated. Beyond the guide pulleys 91, each cord passes downward and around a floating pulley 99 to a second guide pulley |90 mounted on a second guide pulley shaft passing through the top portion of the frame 90 (Figures 1, '1 and 8).

' Beyond the guide pulleys |00, each cord passes through apertures |02 in a third aperture platel |03 likewise mounted on top of the frame 90.

The floating pulleys 99 are supported on axles |04 which in turn are carried by yokes |05 adjustably attached to the floating arms |09, as by the set screws |01 engaging the socket |09 surrounding the end of the floating shaft |09. The latter is mounted in an axle disk |09 through whichpasses the spindle ||2 (Figures '1 and 8). Beyond the disk |09 a continuation shaft ||0 may be supplied, and provided with a movable counter-weightl'lll withI a set screw ||2 engaging the shaft 0. By sliding the counter-weight along the shaft H0, it is obvious that the amount of force required to lift the floating pulley 99 will be varied. For each cord being impregnated, thereis provided a separate floating pulley 99 and the devices associated with it, as

described above. l y

Between the spindle ||9 and the floating pul'- ley 99, a connecting rod ||4 is attached, as by the yoke 5 pivotally engaging it by means of the pivot pin ||9 (Figure 8). Each connecting rod ||4 near its opposite end carries an upper collar vis attached to the frame 90. The vopposite end of the lever |9 is provided with a bracket |22 whichv carries the mercury switch |22. 4The latter is connected by suitable wiring to the remainder of the electrical circuit.

Pivotally secured to the upper end of the frame arm |2|, -which is spaced from the main frame 90 by the horizontalarm |29, is alever |29. One end of the lever nds bearing support. on the pivot.l pinv |30, whereas the opposite end is piv-v otally connected, as at |2| to the connecting rod |22.. The lower end of the latterV is pivotally connected, as at |22, 4to the lever |24 which in turn is pivotally supported, as at,|25, on the upwardly extending frame arm v|29. is provided with a latch arm |21 which has a cutaway portion |22 engaging one end of the switch arm |29.A 'The latter is pivotally mounted, as at |40, to the vertical frame member |4| and carries- 'the mercury switch |42. The latter is similar to the mercury switch |22, and is likewise 4con- The lever |24 nested-by suitable wiring to the remainder of the electrical circuit hereinafter described in detail. The lever |29 is provided with a stop arm |42 which is pivotally attached thereto, as at |44, be-

tween the two ends and |2| thereof.

It will be understood that the apparatus is provided wlth one assembly of the levers and switches |22, Just described, for each cord being impregnated. The draw-ings (Figures 7 and 8) show four such assemblies, for controlling the tension of the four cords illustrated as an example. When the floating 'arm |09 moves upward or downward until'it encounters the stop arms-|42 or |24, it will shift these, disengaging the latch member |21 from the end of the switch arm |22. This causes the mercury switch |42 to be released, breaking the connection in the circuit to which it isfattached. These stop arms |42 and |24 thus constitute limit stops for the oating arm |99. In between these limits,` however,

each mercury switch |23 controls the electricall apparatus as it is shifted up or down by the collars ||1 or ||9 on the connecting rod ||4. The mercury switch4|42 is connected to break the circuit in the latexing unit drive motor 1| and the wind-up motor |45, described later. Each of the .electrical switches |22 is connected to a solenoldal brake hereinafter described.

Wind-up section lof the apparatus Beyond the tension-regulating section of the apparatus is located the wind-up apparatus (Figures 1, 2, 9, 11 and 13). The wind-up apparatus is mounted'upon a frame |50, carrying spools |5|, |52, |53 and |54 (Figure l2). 'Ihese spools serve to receive the cord after it has been impregnated and coated with latex. Before being wound on the spools 5| to |54 inclusive, the cords pass through a guide arm having guide apertures |59 therethrough. The guide arm |55 is secured to a nut |51 which engages interlocking spiral grooves |59 in a shaft |59. 'Ihe latter is supported in bearings |90` attached to the frame |50 and continues as the main drive shaft |93, which in turn carries the main drive pulley |9| secured thereto. 'I'he main drive pulley |9| is grooved as at |62 to accommodate a V-belt whereby itis driven, through appropriate gearing, from the.I Wind-up motor |45 (Figure 10).

, Consequently, when the pulley |9| is rotated, the

nut |51 will move to and fro along the shaft |59, so that'the apertures |59 guide the cords in such a manner that these are wound in even layers The main drive shaft |92 likewise carries the j grooved pulleys |94, |95, |99 and |91, and is supported in lthe pillow block |99 at its outer end (Figures 9 and 13). The grooved pulleys |54, |95, |99 and |61 lare drivingly connected to the pulleys |10, |1|, |12 and |13 respectively by the V-belts |14, |15, |19 and |11 respectively. The pulleys |10 to |13 inclusive are loosely mounted on theshafts |19, |19, |90 and |9| respectively, supported in the bearing blocks o r pillow blocks |92 mounted on the angle members |92 of the frame |50. The hub of each pulley |10, |1I, |12 or |12 is yieldably associated with springs |95, |99, |91 and |99 to collars |99, |90, |9| and |92, which in turn are flxedly secured to their respective shafts, as by set screws (n shown);

- Each-of the shafts na. |19. lan" and m .carries a brakedrum, these brake drums being respectively desrgnsted m, m, lss and las (Figures f 9 and 13). These brake drums are essentially alike, and each is engaged by a brake shoe |91 which is pivotally attached to the yoke |90 on the brake lever |99. The latter is pivoted at one end 200, and at the other end is pivotallyjoined at20| to a plunger 202. Each of the plungers 202 is surrounded by a solenoid, these solenoids being respectively designated 203, 204, 205 and 209. When the solenoids 203 to 205 inclusive are energized, they draw their plungers 202 inward, causing their brake shoes |91 to come in contact with their brake drums |93 to |99 inclusive, retardlng the shafts to which the brake drums are attached.

'rne machine is equipped with four pairs of rollers respectively designated 201 to 2 I4 inclusive. arranged in pairs. The forward rolls 201, 209, 2| i and 2|3 are arranged respectively on the shafts |19 to |9| inclusive, these shafts carrying pulleys 2|5 which drive pulleys 2|6 operativelyconnected with the rearward rolls 209, 2|0, 2|2 and 2|4, through the agency of the V-belts 2|1 (Figure v11. During the operation of the machine each of the cord spools |5| to |54 inclusive rests upon a pair of these rolls and is driven by them.

The mechanism is so arranged that the rolls 201 to 2|4 inclusive are driven at a slightly greater peripheral speed than the speed of the cord. Because of this diierence in wind-up speed, the iloating arm I 05 of each control unit gradually rises until it reaches the point where it causes the mercury switch |23 to make contact, thereby energizing one of the solenoids, such as the solenoid 203. (Figure The latter thus energized operates its brake shoe |91 against the brake drum |93,.causing the wind-up roll 201 to slow down or stop until the fioatingarm |09 drops downward and causes the mercury switch to break the contact and de-energize the brake solenoid 203. When the brake is thus released, the wind-up roll 201 again begins to Wind up the cord, and the foregoing operation repeats itself.

The machine is additionally provided with a limit switch to stop its operation in case the cord tangles, especially in the spindles of the latexing unit. This limit switch is the mercury switch |42, whose mechanical connections have been previously described. If the cord stops winding or tangles on either side of the yfloating pulley 99, the oating arm |05 will either rise and push up the limit stop |43, or fall and push down the limit stop |34. In either case, the result will be the shifting of themercury switch |42, the latter then making a contactv and energizing the operating coil2l0 of the magnetic line starter 2|9, throwing out the switch thereof and disconnecting the power current from the latexing unit motor 1| and the wind-up motor |45 (Figure 10). It will be understood that the limit switch |42, instead of disconnecting the motors 1| and |45 from their power current sources might energize two magnetic clutches which would similarly disconnect the power and accomplish the same result,` without exceeding the scope of my invention.

Modified ,form of latexing section of the apparatus The slightly modified form of latexing app'a.- ratus shown in Figures 16 to 19 inclusive is substantially similar to the form shown in Figures 3 to 6 inclusive, as will be seen by a comparison of the drawings. The spindles'223 of the modifled form, however, are arranged in staggered positions, whereas the spindles were arranged inlsubstantially a straight line. The staggered arrangement enables the spindles to be equipped Operation The operation of the mechanical and electrical parts of the machine has been previously dis- Vclosed at the time these parts were described.

The cords pass from the spools 5, 6, 1 and 9 through the apertures 18 of the aperture plate i0 into the latex solution in the latex tank i5 (Figures 1 and 2), thence through thev apertures 14 of the cord guide plate 12. From the latter, the cords thread their way in and out between the rollers 25', having the grooves 21 to space the cords, on their way passing between the squeeze rolls 31 and 4| and also between the squeeze rolls 50 and 54. While passing around the rollers 25, the cord is alternately flexed in opposite directions, since the direction ofrotation is reversed between every roller by the arrangement of the gearing. This causes the cord toi be flexed first one way and then the other, the twist thereof being thus opened up, permitting the latex solution to penetrate through the innermost fibers of the cord. 'Ihe squeezing and wringing action of the squeeze rolls further facilitates the thorough soaking of the cord with the latex and aids in the penetration of the latexing solution. Since all ofthe rollers and the squeeze rolls` are driven, andare geared so that thev peripheral speeds of all are the same, the cord isl carried through the solution under very little tension. 'Ihis reduction in the tension necessarily retards the tendency to twist the cord tighter, such as would result if the cord were pulled through the solution under a greater tension, and causes the cord strands to open up in a more satisfactory way.

The cords emerge from the squeeze rolls 50 and 54 and then pass through the apertures 15 of the cord guide plate 13, thence upward through the apertures 93 of the aperture plate 19 above the latexing solution. The level of the latter may be adjusted by rotating the hand crank 22, and thereby moving the latexing tank up or down.

The cords then pass through the drying troughsv 92 -where their external surfaces are dried with air directed thereon vfrom the drying pipes 93. The cords then pass over the guide pulleys 91, around the floating pulleys 99, over the guide pulleys |00, through the apertures |02 of the aperture plate |03, thence through the apertures |55 in the guide arm |55, and thence on to their respective spools |5| to |54 inclusive. During this travel of the cords as described above, the tension of the cord is regulated by the floating arms |05 and the mercury switches |23; and the machine is protected by the mercury limit switch |42 in case any of the cords become tangled or for any reason are not wound on their spools.

In utilizing my apparatus and process, it will be understood that it is not necessary to confine the arrangement of the spindles 23 or 223 to the straight-line or staggered positions shown: on the contrary the spindles may be arranged in a circle, semi-circle or any other convenient path. It will also be understood that the squeeze rolls sage of the cords therebetween and therearound 31, 4l, 50 and 54 may be omitted if desired, without departing from the scopeof my invention.

The tension under which the cords operate may be varied as desired. 'I'his is accomplished by 5 shifting the position of the'counter-weight |.I I on' each of the ,floating arms |06 (Figure 8).

The cord before latexing has the loose fuzzy construction: shown in Figure 20. After passing through the `latezring, impregnating andA drying 10 process, however, they cord possesses a tightly wound and smooth appearance as shown in Figure 21. It will be understood that the drying step may be omitted, ifl desired, without departing from the scope of ,my invention.

It will be understood that I desire to comprehend within my invention such modifications as may be necessary to adapt it to varying conditions anduses. v f

Having thus fullydescribed my invention, what I claim as new 'and .desire to secure by Letters Patent is:

1. -A machine for impregnatlng cords with latex comprising a plurality of power-driven members adapted to be immersed in a latex solution, the

adjacent members being driven in opposite directions, said` members being disposed in verticaldlrections.

v 2. -A machine for impregnating cords with latex.

comprisingaplurality of power-driven members adapted to be immersedv in a latexsolution, the

adjacent members being *driven in opposite directions,.said members being disposed in vertical directionsand driven from their upper ends,v Vwherebyto exclude latex from the driving parts thereof.

3. A machine for impregnating cords with latex comprising a pluralitylf power driven grooved rollers adapted to support the cords in the grooves fo'r movement therearound in a serpentine path 40 to produce sharpbending to `open the strands.l

thereof, said rollers being adapted 'to be immersed in a latex solution. said rollers being spaced apart from one another to permit the pasfor substantially degrees in a sharply bending circuitous path.

4. A machine for impregnating cords with latex ,v

comprising 4a plurality of power-driven rollers adapted to support the cords for movement therearound and therebetween in a sinuous pathto produce sharp bending and intermittently open the strands thereof, said rollers being adapted to be cords to pass between said rollers at spaced intervals.

6. A machine for impregnating cords with latex comprising a `plurality of vertically-disposed power-driven rollers with annular grooves therein at spaced intervals,and means for guiding the c'ords to passbetween said rollers at spaced interyals. s'

'7.l A machine for impregnating cords with latex comprising a plurality of vertically-disposed power-driven'rollers having a driving connection f and bearing support at their upper ends only, and

means for guiding the' cords to vpass between said 'rollers at spaced intervals. i A

8. A machine for impregnating cords with latex. i

comprising` a plurality'- of vertically-disposed power-driven rollers'having a driving connection and bearing support -at their upper ends only, and means for guiding the cords to passbetween said rollers at spaced intervals, said rollers having annular groovesv to assist the guidance of said cords.-

NORMAN J. ZEtI'vIZERT. 

